Device for separating printing rollers in the absence of paper sheet



G. BABICZ Dec, 9, 1947.

DEVICE FOR SEPARATING PRINTING ROLLERS IN THE ABSENCE OF PAPER SHEETFiled Dec. 15, 1944 5 Sheets-Sheet 1 INVENTOR.

Dec. 9, 1947. r G. BABlCZ 2,432,133

DEVICE FOR SEPARATING PRINTING ROLLERS IN THE ABSENCE OF PAPER SHEETFiled Dec. 15', 1944 5 Sheets-Sheet 2 INVENTOR Gear efiabw BY Dec. 9,1947. v e. BABICZ 2, 3 DEVICE FOR SEPARATING PRINTING ROLLERS IN THEABSENCE OF PAPER SHEET Filed Dec. 13, 1944 s Sheets-Sheet s INVENTORPatented Dec. 9, 1947 DEVICE FOR SEPARATIN-G PRINTING ROLLER-S IN THEABSENCE OF PAPER SHEET I George 'Babicz, Chicago, 111.

Application December 13, 1944, Serial No. 568,023

9 Claims.

The present invention broadly relates to machines having a plurality ofcontacting rollers between which a material is fed, in combination withan electrical device for automatically separating the rollers when thematerial ceases to be fed therebetween for any reason. More specificallythe invention relates to printing machines for the purpose of separatingrollers so that the compressing roller may not unnecessarily gather inkwhen in contact with the printing roller when the paper to be fedtherebetween to receive printing impressions ceases to be fed betweenthe rollers.

A still further object of the present invention is the provision of asuitable electrical means including an electric circuit insulated fromthe machine, including a pair of contacts, one of which intermittentlyshifts towards the other, and in the path of the sheets of paper as itis fed towards the printing rollers, and whereby said contacts maycomplete an electric circuit in the absence of the paper so as toenergize a solenoid, the latter connected with suitable mechanism forseparating the rollers when the paper ceases to be fed therebetween.

A still further object of the present invention is the provision of asuitable mechanism whereby the rollers, on their separation, asaforesaid, make intermittent contact so as to grasp the paper as thesame commences to be fed anew in between the rollers.

With the above general objects in view and others that will appear asthe invention is better understood, the same consists in the novelconstruction, combination and arrangement of parts hereinafter morefully described, illustrated in the accompanying drawing and pointed outin the appended claims.

In the drawing forming a part of this application and in which likedesignating characters refer to corresponding parts throughout theseveral views:

Fig. '1 is a side elevational view of one end of a printing machine;

Fig. 2 is a side elevational view thereof from the opposite side;

Hg. 3 is a fragmentary, elevational end view of the machine, partly insection, the view having been taken substantially on line. 3-3. of Fig.2;

Fig. 4 is a top plan elevational view of the ma chine;

Fig. 5 is an enlarged cross-sectional View through the electriccontacts; and V Fig, 5 is a diagrammatic view of the electric circuit.

Referring in detail to the present drawings there is shown therein apair of horizontal spaced frame bars Ill, supported in any suitablemanner by and upon four standards I I, two of which are shown in thedrawings.

Supported upon standards II and within any suitable bearings therein isshaft I2, which is driven by means of sprocket wheel I3, keyed thereto,and sprocket chain I4. Said sprocket wheel I3 and chain I4 are disposedoutwardly of one of said standards -I. I. Carried by said shaft I2 isprinting roller I5 which is disposed between a pair of end standards II, as is seen in Fig. f1.

The upper ends of standards II are bifurcated with slots I5 whereinbearings I! are receivable, and wherein the same are adapted for uprightshifting movement, being guided in that movement by means of flanges I-8which engage the body of each of said standards I I andat the marginaledges of said slots I6.

Said'standards I I are topped by plates I9 which are a-fiixed thereto bymeans of screws 2!]. In threaded engagement with each of said plates I9,and downwardly depending therefrom is a cylin-v drical bar 2I, which hasa reduced, lowerend 2, receivable within socket 23 made at the upper endof each of said bearings I'I. Interposed between the .bottoms of saidplates I9 and upper ends of bearings I1, and encompassing each of saidcylindrical bars 2|, is coil spring 24, normally bearing againstbearings I1, and urging the same downwardly. Set within bearings I! forrotary movement is shaft 25 which carries compressing roller 26. ShaftsI2 and 25 carry gear wheels 21, which mesh and through which the rotarymovement of shaft I2 is transmitted to shaft 25, whereby rollers I5 and26 rotate in opposite direction so as to receive the paper as the sameis fed towards and between them for transferring thereto printingimpressions from roller I5 while the paper is pressed thereto by roller26.

At the opposite end of shaft I2 there is keyed thereto cam 28 which hasrise 29 at one point of its periphery, forthe purpose of actuating bar30 through contact with idler 3! carried by said bar 30. The lower endof said bar 30 is bifurcated as at. 32, within which the grooved portion33 of shaft I2 fits, thereby maintaining the lower end of'bar 3!! in itsoperative position and without interfering with the operation of saidshaft I2.

Attached in an adjustable fashion by means of slot 3.4 and, bolt 35 islink 36, having an enlarged head 31 at one of its ends, and within whichshaft 3.8-is keyed. It will. therefore be seen that through $1. mfidiumof slot 34 and bolt 35, which passes frame bar 40, and by its upper endsupports shaft 38 within which the same is freely mounted for rotarymovement.

The upper end of bar 30 carries a transverse pin 44, and a like pin 45is alfixed to supporting member 4|, for the purpose of attaching theretocoil spring 46, which tends to urge bar 30 towards shaft l2, therebymaintaining idler 3| in constant f contact with cam 28.

Suspended upon the inner end of shaft 38, and in a transverse, as wellas longitudinal adjustable relation therewith, and maintained thereon inits adjusted position by means of screw 41 is block 48, which by itslower end carries rod 49, which is longitudinally adjustable within saidblock 48 and readily engaged therewith in its adjusted position by meansof screw 50. By its opposite angularly bent end said rod 49 carries aresilient strip 5|, which by its free end carries a rigidly aflixedinverted cup-like member 52 through which rod 53 is extended in alongitudinal relation. Said rod 53 terminates at its lower end incontact 54 which extends through strip 5| and insulating pad 55. Rod 53adjacent its lower end has flange 56. Set upon rod 53 and interposedbetween flange 56 and the top wall of member 52 is coil spring 51 whichurges contact 54 downwardly. A pair of nuts 58 engage the extended upperend of rod 53 in a threaded engagement, and interposed between said nuts58 is one end of wire 59, the other end connecting with battery 60. Itis of course understood that cup-like member 52, contact 54, flange 56,rod 53 and nuts 56 are insulated from strip 5| in any suitable manner,as well as from the entire machine.

Supported by transverse frame bars 6|, which connect with frame bars Iis a pair of horizontal guides 62 and a pair of vertical guides 63 uponand within which paper 64 is guided in its shifting movement towardsrollers l and 26 as the same is fed thereto by means of suitableconveyor, the latter not shown in the drawings.

Aflixed to the underface of one of said guides 62 is channel 65 filledwith insulation 66, within which rod 61 is embedded. One end of said rod61 terminates in an upwardly extending contact 68, in alinement withcontact 54. The opposite end of said rod 61 extends beyond channel 85,and is threaded to receive a pair of nuts 69 in a threaded relation, forclamping therebetween one end of wire 10. The latter wire connects byits other end with solenoid 1|, which is supported upon shelf 12adjacent the lower end of one of standards Wire 13 connecting withbattery 60 and solenoid 1|, completes the electric circuit.

The upper end of contact 58 is substantially on a plane of the upperface of guide 52 and therefore on the plane of the shifting paper as thesame is fed towards rollers l5 and 26.

, From the hereinabove description it will be readily seen that due tothe action of cam 23 intermittent longitudinal shifting movement to bar30 is imparted, rise 29, when contacting with idler 3| shifts said bar.30 in one direction, while spring 46 retracts said bar 38 to itsstationa y original position as riser 29 leaves said idler 3|. By virtueof this arrangement bar 38 is shifted away from shaft I2, and returnedthereto, once during each revolution of cam 28 and roller |5. Thisintermittent shifting of bar 38 is transmitted to shaft 38, impartingthereto rocking movement through the mediumof link 36. This rockingmovement of shaft ,38 is in turn transmitted to block 49, therebycausing intermittent movement of the outer end of strip 5|, and verticalmovement of cup-like member 52 for intermittently bringing contact 54toward contact 68 and away from it. Normally paper travels betweencontacts 54 and 68 upon guides 62, and there is no interference with thevertical shifting movement of contact 54 by the paper. The oscillationof contact 54 continues independently of paperras the same is fed torollers |5 and 2B,

except that as long as paper continues to be fed,

the same constitutes an insulating gap between contacts 54 and 68,preventing the completion of the electric circuit through wires 59 and73 and battery 65 for energizing solenoid II. If however there is nopaper upon guides 62 contacts 54 and 68, directly touching each other ondownward shifting of contact 54, will complete said circuit to energizesaid solenoid 1|. It is further observed that the downward shiftingmovement of contact 54 towards contact 68 occurs once during eachrevolution of rollers I5 and 26 due to the action of rise 29 upon cam28, as the former actuates idler 3| and shifts bar 30 for rocking shaft38, block 48, rod 49 and strip 5| for imparting intermittent oscillatorymovement to contact 54 as hereinabove described.

On the opposite side of the machine plate 14 is affixed to the adjacentframe bar l0 by means of screws 15, the upper portion of which extendsabove the upper edge of said adjacent frame bar I0, and is off-set fromthat face outwardly. Mounted within one end of supporting member 4| andthe upper portion of plate 74 is shaft 16, which is disposedtransversely of the machine, and above vertical guides 63. Said shaft 16carries a gear wheel 11 adjacent each of its ends and in a verticalalinement with each frame bar l8. Each of said gears 11 has anintegrally formed bearing I3, spacing each gear from supporting member4! or plate 14. Meshing with each gear 11 is pinion 19, each having anintegrally formed bearing. 80. Said pinions l9 and their bearings areset upon shafts 8|, rigidly carried by supporting member 4| and plate14, and upon which said pinions 19 are set for rotary movement whenactuated by gears 71.

Set within recess 82 made in the inner face of each standard I andpivoted thereon by means of bolt 83 is lever 84, which is disposed belowbearings l8 and 80 and in alinement therewith, and on a plane betweengears 11 and pinions l9 and their respective supporting member 4| andthe upper end of plate 14. One end of each lever 84 has an upwardlyprojecting extension 85, which contacts with and supports bearings il.Each of said bearings 80 has an integrally formed stud 86 which radiallyprojects from said bearing 88 and which normally rests upon the longerfree end of lever 84, and at an incline or obliquely thereto as is seenin full lines in Figs. 1 and 2, for the purpose hereinafter described.

Keyed to one end of shaft 16 is bar 81, the opposite end of which ispivotally connected as at 88 to the bifurcated end 89, which is afiixedto the upper end of rod 90. The latter rod is integrally formed withstop 9| and core 92. Said core 92 is positioned centrally of solenoid'lland is adapted for vertical shifting movement there within. As isobvious, when said solenoid is energized when the electric circuit,shown in Fig. 6, is completed through contacting contacts 54 and 68,said core 92, due to the magnetic action of said solenoid I I, will becaused to shift downwardly, shifting therewith rod 90* for angularshifting movement of bar 81 for rocking shaft 16. Stop 9| constitutesmeans for limiting the maximum shifting movement of said core 92', astheformer comes in contact with the upper end of solenoid I I.

The Shfting movement of said bar 81, as aforesaid, will cause rotarymovement of gears TI, which in turn will impart rotation to pinions l9and their bearings 80 into opposite direction, effecting in turn angularshifting movement of studs 86 from their inclined, oblique position tothe vertical position indicated by dotted lines in Fig. 1. This angularshifting movement of studs 86 will exert downward pressure upon theouter ends of levers 84 for shifting the same upon their pivots 83, forelevating the inner ends of said levers 84, including their extensions85, for actuating bearings I! in an upward direction, and against thetension of springs 24, and to the position indicated by dotted lines inFig. I. The upward shifting movement of said bearings I! willsimultaneously shift bodily shaft 25 and roller 26, but will notdisconnect gears 27, the latter continuing in engagement by their teeth.because the elevation of bearings I1 and roller 26 is only to a fractionof an inch not suhicient to disengage teeth in the two gears 21.

The upward shifting movement of bearings H by levers 84 is effectuatedagainst the tension of springs 24, sockets 23 being of course deeperthan the reduced lower ends 22- of said cylindrical bars 2| permittingupward shifting of bearings I'I. When however studs 85 release thepressure upon levers 84, from the position shown in dotted lines in Fig.1, springs 24, exerting tension upon the upper ends of bearings I'I,bring the same back to normal position, with roller 26. It is observedhowever, that levers 84 are actuated for elevating bearings I I forseparating roller 26 from roller I5 only at the time when solenoid I Iis energized, and then only when contacts 54 and 68 have directly beenbrought together. However; as long as paper is fed to rollers I 5 and26, the same acts as insulation between said. contacts 54 and 68,preventing completion of the electric circuit. It is only when the paperceases to be fed to said rollers I5 and 26 that gap between contacts 54and 68 is removed to bring them directly together for completingelectric circuit to energize solenoid H and thereby to actuate shiftingof levers 84 for separating the two rollers.

From the hereinabove description it will be seen that when paper ceasesto be fed towards rollers I5 and 26 and electric circuit is completed toenergize solenoid II, due to the action of cam 28 on bar 30, roller 26is raised upwardl and separated from roller I5 by the action of levers84 upon bearings I'I. Ordinarily such separation would continue only fora brief period of time, equivalent to the time required for riser 29 topass past idler 3!. Measured in terms: of the revolution of roller 26.that interval during which said roller 25 would remain raised andseparated from roller I5, would be equivalent to a fraction of therevolution of said roller 26, and during the remainder of itsrevolution, said roller 26 would remain in contact with roller I5. To

obviate this result, and to bring about a longer:

separation of roller 26 from roller I5 during each revolution of saidroller 26', and consequentlyto bring about contact between the tworollers dur-. ing each revolution thereof, and for a brief period oftime, so as to condition said rollers to grasp paper as the same is fedtherebetween anew, suitable mechanism, best shown in Figs. 2 and 3 isprovided. That mechanism includes support 93 affixed in any suitablemanner to the outer face of one of standards II. Hingedly connected bypivot 94 to the outer end of support 93 is a vertically disposed bar 95,having at its lower end and above support 93' a regulatingscrew 96'passing through said bar 95 and bear ing against stop 97 upwardlyextending from said support 93. Said screw 96 and stop 91 regulateorlimit the maximum degree of shifting of said bar 95 towards standardII. Coil spring 98 affixed to plate I9 and pin 99, the latter extending"from the upper end of said bar 95, normally urges said bar 95 towardsstandard II. Substantially in its central portion said bar 95 has atransverse recess I00 made therein at a point which is substantially inalinement with the lowermost position of bar 81 when the latter isbrought to that position by the action of solenoid 'II as hereinabovedescribed. As soon as bar 81 is shifted to its lowermost position andcomes in alinement' with recess I00, by virtue of the action of spring98 upon bar 95, bar 81 finds itself within recess I00 and thereby islocked to said bar,95 the position illustrated by dotted lines in Fig.3.

Coil spring IOI attached to standard II and bar 8! normally maintainssaid bar 81 in its inoperative elevated position, shown in full lines inFig: 2, and brings the same to that latter position when solenoid H hasbeen (fie-energized.

Aflixed to the outer adjacent end of shaft 25 is wheel I92 carrying uponits face cam mg I 03, which is positioned adjacent the rim of said wheelI92, and which, by its inclined face, rides upon the inner edge of bar95', and adjacent the upper end of the latter, as said wheel I02rotates, for the purpose of tripping said'bar 95 and of shifting thesame against the tension of spring 98', for freeing bar 81 from itslocked engagement by bar 95 and from its recess I00. Once said recess Iis brought out of the pathof the upright shifting movement of bar 81, byaction of cam lug I03, as it strikes the upper end of" bar 95, said bar8'! automatically shifts upwardly due to the action of spring I9I, andbrings said bar to its inoperative position shown in full lines in Figs.2 and 3.

The action of cam lug !93 upon bar to release the same from itsengagement with bar 07, is timed with the action of cam 28 upon bar 30.When the electric circuit has been completed through contacts 54 and 68,in the absence of the paper therebetween, and solenoid II is energt'zedwith bar 81 shifted downwardly to the position indicated by dotted linesin Figs. 2 and, 3 and against the tension of spring I 9|, roller 26becomes elevated and separated from roller [5. At that very instant whensaid bar 8'!- has been brought to its downwardly shifted position, bar95- instantaneously engages the same as hereinabove described. At thatmoment cam lug I93 remains in a position past said bar 95. Therefore theengagement between bars 95 and 81 will continue during almost entirerevolution of wheel I52 and thereby of roller 29 until wheel 82 completes its revolution and cam lug I03 is brought in contact with bar 95to deflect the same from its engagement with bar 81. When this actiontakes place bar 81 instantaneously shifts upwardly by action of springI9I, thereby actuating levers 84 to release their hold upon bearings I!for shifting the same downwardly and thereby bringing roller 25 incontact with roller I5. This contact between the two rollers is ofcomparatively brief duration, during each revolution of rollers I and26, and continues only until rise 29 of cam 28 is again in contact withidler 3| to shift contact 54 towards contact 58 for completing electriccircuit and energizing solenoid II. It will therefore be seen that inthe absence of paper between contacts 54 and 63 action of rise 29 uponidler 3| brings about the completion of the electric circuit andenergizing of solenoid 'II, by shifting contact 54 in contact withcontact 68, which action takes place once during each revolution ofroller I5, and thereby once during each revolution of roller 26. Actionof bar 95 upon bar 81 maintains roller 26 in a separated relation withroller I5 during the major portion of the rotation of said rollers andcam lug H13 releases the engagement between said bars 95 and 81 onceduring each revolution of said rollers I5 and 28, thereby bringing aboutcontact between said rollers once during each revolution thereof. Theaction of rise 29 upon idler 3i is of course timed with the action ofsaid cam lug I03 upon bar 95, namely when cam lug I93 strikes bar 95rise 29 is out of contact with idler 3|.

From the hereinabove description it will be seen that when no paper isfed towards rollers I5 and 26, said roller 26 is separated from rollerI5 during the major portion during each single revolution, with roller26 brought in contact with roller I5 for a brief interval of time duringeach revolution of said rollers, for the purpose of conditioning the tworollers for grasping the paper when the same commences to be fedtherebetween anew. It follows that in the absence of paper shiftedbetween contacts 54 and 58 bar 87 is shifted downwardly and into alocked engagement with bar 95 by the action of rise 29 upon idler 3|,also once during each revolution of rollers I5 and 26. However, said bar87 is maintained in a downwardly shifted position and in lockedengagement with bar 95, not by virtue of solenoid H and consequently notby virtue of action of rise 29 upon idler 3!, but by virtue of theaction of spring 98 in maintaining said bar 95 in engagement with saidbar 87. This engagement continues almost through the entire singlerevolution of roller 26 when the latter is in an elevated position andseparated from roller I5. It is only during a brief period of timeduring each single revolution of roller 26 that the same is brought incontact with roller I5, and that contact between the two rollers isbrought about by the action of cam lug I03 upon bar 95 for releasing thesame from engagement with bar 31 and for permitting said bar 81 to shiftupwardly due to the action of spring IOI. As stated, when bar 81 shiftsupwardly and out of engagement with bar 95, solenoid 'II remainsde-energized, because at that particular moment rise 29 of cam 28 is outof engagement with idler 3|, and therefore contacts 54 and 68 are not incontacting position.

From the hereinabove description it will be seen that by the action ofcam 28 upon bar 99, by the action of spring IBI, as well as by theaction of bar 95 and cam lug I93, bar 81 is inter mittently angularlyshifted, downwardly during the major portion of each revolution ofrollers I5 and 26, and upwardly during a brief period of the revolutionof the said rollers, for the purpose of bringing roller 26 in contactwith roller I5 for a short interval of time during each revolution ofsaid rollers, all in the absence of a paper sheet between the contacts54 and 68.

As hereinabove stated the teeth of gear wheels 2! are at all times inmesh, regardless whether rollers I5 and 26 are in contact or not,thereby transmitting constant rotation to roller 26 as well as to wheelI02.

While there is described herein a preferred embodiment of the presentinvention, it is nevertheless to be understood that minor changes may bemade therein without departing from the spirit and scope of theinvention as claimed.

What I claim as new is:

1. In a printing machine having a pair of printing rollers, towards andbetween which a paper sheet is fed, said rollers being set upon shafts,means for separating the rollers in the absence of paper sheetcomprising a pair of contacts positioned in the path of the paper sheetas the same is shifting towards said rollers, a bar supported upon oneof said shafts, a cam carried by one of said shafts for intermittentlyshifting said bar, a rocker shaft, a rod connected with said rockershaft, one of said contacts being carried by said rod, said bar and saidrocker shaft being connected for imparting rocking movement to thecontact carried thereby for moving the same to or away from the other ofsaid contacts by the action of said cam on said bar, a solenoid, saidsolenoid and said contacts being connected in an electric circuit forenergizing said solenoid when said contacts come together in the absenceof paper sheet therebetween, and means associated with thesecond-mentioned shaft and actuated by said solenoid when energized forcausing shiftingof the other of said rollers by the action of thesolenoid away from the first of said rollers.

2. In a printing machine, a pair of standards, a roller set by its shaftwithin said standards for rotary movement, bearings positioned withinsaid standards for shifting to or away from said roller, a shaftjournaled within said bearings, another roller set upon said shaft, thetwo rollers normally contacting for continuously receiving sheet ofpaper therebetween, a pair of contacts positioned in the path of paperas it shifts towards said rollers, a solenoid, said electric contactsand said solenoid being connected in an electric circuit, means operatedby the first-mentioned shaft for intermittently bringing said contactsto or away from each other, in the absence of paper sheet said contactsbeing adapted to complete an electric circuit when brought together forthe purpose of energizing said solenoid, and means associated with thesecond-mentioned shaft and operable by said solenoidwhen energized forcausing shifting of said bearings away from said first named roller bythe action of the solenoid for sep arating the two rollers.

3. In a printing machine, a pair of standards, a roller set by its shaftwithin said standards for rotary movement, bearings positioned withinsaid standards for shifting to or away from said roller, a shaftjournaled within said bearings, another roller set upon said shaft, thetwo rollers normally contacting for continuously receiving sheet ofpaper therebetween, a pair of contacts positioned in the path of paperas it shifts towards said rollers, a solenoid, said electric contactsand said solenoid being on an electric circuit, means for intermittentlybringing said contacts to or away from each other, a lever pivotedwithin each of said standards, by its inner end said lever eontactingwith each of said bearings,- in the absence of paper sheet said contactsbeing adapted to complete an electric circuit for energizing saidsolenoid, and means actuated by said solenoid when energized andass'oiatd with the oppesite end of each of said levers for angularlyshiftin said levers by tli action of' the solenoid for shifting saidbearings away fromsaid first named roller for separating the tworollers.

4. In a printing machine, a pair of rollers, towards and between which apaper sheet is fed, a pair of contacts in the path of the paper as thesame shifts towards said rollers, means for intermittently shifting saidcontacts to or away from each other, once during each revolution of saidrollers, a solenoid, said solenoid and said contacts being connected inan electric circuit, in the absence of paper sheet between said contactssaid solenoid being adapted to be energized when said contacts arebrought together, a pair of bearings within which the shaft of one ofthe said rollers is journaled, said bearings being adapted to shift toor away from the other of said rollers, a lever contacting said bearingsfor normally maintaining said rollers in contact with each other, a barin association with said lever and in contact with said solenoid, saidbar being adapted for shifting movement by the action of said solenoidwhen energized for actuating said lever for shifting said bearings awayfrom said first named roller for separating the same, and means operableindependently of said solenoid for maintaining said bar in its shiftedoperative position during the maj or portion of the revolution of saidrollers.

5. In a printing machine, a pair of rollers, towards and between which apaper sheet is fed, a pair of contacts in the path of the paper as thesame shifts towards said rollers, means for intermittently shifting saidcontacts to or away from each other, once during each revolution of saidrollers, a solenoid, said solenoid and said contacts being connected inan electric circuit, in the absence of paper sheet between said contactssaid solenoid being adapted to be energized when said contacts arebrought together, a pair of bearings within which the shaft of one'ofthe said rollers is journaleol, said bearings being adapted to shift toor away from the other of said rollers, a lever contacting said bearingsfor normally maintaining said rollers in contact with each other, a barin association with said lever and in contact with said solenoid, saidbar being adapted for shifting movement by the action of said solenoidwhen energized for actuating said lever for shifting said bearings awayfrom said first named roller for separating the same, and means operableindependently of said solenoid for maintaining said bar in its shiftedoperative position during the major portion of the revolution of saidrollers, said last named means including a locking bar engaging saidfirst named bar when the same is in a shifted operative position whenbrought to that position by said solenoid when energized, said lockingbar engaging said first named bar during the major portion of therevolution of said rollers, and a cam device for disengaging saidlocking bar from said first named bar, said cam device being operableonce during each revolution of said rollers.

6. In a printing machine, the combination of a pair of printing rollersadapted to receive a .paper' sheet therebetween, shafts mounting saidrollers, means mounting one of said shafts for bodily movement of theroller thereon toward and from the coacting roller on the other shaftand including bearings and levers .pivotally mounted and supporting thebearings thereon for bodily shifting movement upon sv'ving ing action ofsaid levers,- electrically operated means operativeiy' connected withsaid levers and causing shifting of the levers by the action of theelectrically operated means to cause a shifting movement of saidfirst-mentioned roller, electric circuit closing devices connected withsaid electrically operated means for energizing said means upon thefailure of feeding of a paper sheet to the rollers, and means actuatedby the secondmentioned shaft for operating said circuit closing devices.

7. In a printing machine, the combination of a pair of printing rollersadapted to receive a paper sheet therebetween, shafts mounting saidrollers, means mounting one of said shafts for bodily movement of theroller thereon toward and from the coacting roller on the other shaftand including bearings and levers pivotally mounted and supporting thebearings thereon for bodily shifting movement upon swinging action ofsaid levers, means including a solenoid for operating said levers tocause separating action of said first-mentioned roller, a pair ofelectric contacts arranged in the path of feeding of the sheet andconnected in an electric circuit with the solenoid for controlling theaction of said solenoid, and means actuated by the secondmentioned shaftfor causing relative closing movement of the contacts to close thecircuit to the solenoid in the absence of a paper sheet between thecontacts.

8. In a printing machine, the combination of a pair of coacting printingrollers adapted for the feeding of a paper sheet therebetween,shaftsmounting said rollers, means mounting one of said shafts forbodily movement of the roller thereon relative to the roller on theother shaft in separating action, and means for causing movement of saidmounting means for relative separation of the rollers includingelectrically actuated means for causing relative shifting of the rollersby actuation of said electrical means, a pair of contacts positioned inthe path of the paper sheet and electrically connected with saidelectrically actuated means, an arm supporting one of said contacts formovement toward and from the other, supporting means for said arm forcausing rocking movement thereof, and means for operating said armincluding a rod mounted for longitudinal movement, and a cam mounted onthe second-mentioned shaft and having operative relation with said rodfor actuating the rod to cause circuit closing movement of the contactsin the absence of a paper sheet therebetween.

9. In a printing machine. the combination of a pair of printing rollersadapted to receive a paner sheet thereb tween, shafts mounting said rolrs. me ns mounting one of sa d shafts for b dily movement of the rollerthereon toward and from the coacting rol er on the other shaft andincluding bearings and levers pivotal y mounted and suppor ing thebearings thereon for bodily shifting movement u on swing ng action ofsaid levers. means includ ng a sol noid for operating sai l vers tocause separatin action of said firstmen io ed roller. a pai o electriccontacts arranged in the path of feeding of the sheet and connected inan electric circuit with the solenoid 11 for controlling the action ofsaid solenoid, an arm supporting one of said contacts for movementtoward and from the other contact, supporting means for said arm forcausing rocking movement thereof, and means for operating said arm andactuated by the second-mentioned shaft to cause circuit closing movementof the contacts in the absence of a paper sheet therewith.

GEORGE BABICZ.

REFERENCES oI'rED The following references are of record in the file ofthis patent:

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